Heat-treatment condition
State the exact H condition if the part needs a certain strength or hardness.
Precipitation Hardening Stainless Steel Round Bar
Stainless Steel 13-8PH Round Bar Manufacturer, Exporter and Supplier
Stainless Steel 13-8PH Round Bar (UNS S13800) is a strong stainless steel used for parts that carry heavy loads. It has good toughness and corrosion resistance. Heat treatment can make the material harder and stronger. It is used for aircraft parts, shafts, fasteners and other parts where reliable strength matters. The grade is also called PH 13-8 Mo.
13-8PH is normally supplied in a specified condition, such as solution treated or H950, H1025 or H1150. The chosen condition affects strength and toughness. Buyers can compare it with 17-4PH stainless steel round bar and 15-5PH stainless steel round bar when choosing a material for a high-strength part. The drawing and required heat treatment should guide the final choice.
At a glance
Stainless Steel 13-8PH Round Bar quick facts
- Grade and UNS
- 13-8PH / S13800
- Other name
- PH 13-8 Mo
- Stainless steel type
- Martensitic precipitation hardening steel
- Main bar specifications
- ASTM A564/A564M and AMS 5629, when ordered
- Common heat-treatment conditions
- Solution treated, H950, H1000, H1025, H1050, H1100, H1150
- Details to give when ordering
- Diameter, length, condition, quantity, finish and testing
Check the required standard and heat-treatment condition before ordering. Availability depends on size and specification.
Material overview
What Is Stainless Steel 13-8PH Round Bar?
13-8PH is a stainless steel that gets much of its strength from heat treatment. Its main alloy elements include chromium, nickel, molybdenum and aluminium. The steel is first prepared in a solution-treated condition. A later ageing treatment helps it reach the required strength and hardness.
This grade is used when a part must be strong but still resist corrosion. It is not the same as a regular stainless steel round bar used for general fabrication. The grade and heat-treatment condition both need to match the drawing.
Buyer guide
How to Select Stainless Steel 13-8PH Round Bar
Start with the grade and the work the part must do. A shaft or aircraft component may need a specific strength and ageing condition. Check the drawing before choosing a bar size or finish. For a different balance of strength and corrosion resistance, compare stainless steel 431 round bar with the same design requirements.
Material and standardState 13-8PH, UNS S13800 and the required ASTM A564 or AMS 5629 edition.
Heat treatmentTell the supplier whether you need solution treated, H950, H1000, H1025, H1050, H1100 or H1150 material.
Size and finishGive the diameter, length, quantity, tolerance, straightness and surface finish.
Tests and documentsAsk for the required MTC, heat number, chemical tests and mechanical tests.
If the part needs a smooth surface or close size control, ask about bright round bar finishes. Allow extra material for machining where required.
Common uses
Applications of Stainless Steel 13-8PH Round Bar
13-8PH is often used for parts that need high strength, good toughness and resistance to everyday corrosion. The right heat treatment matters in each case.
- Aircraft parts: Fittings, fasteners and other load-bearing parts made to an approved drawing.
- Shafts and spindles: Components that need high strength and close machining tolerances.
- Valve and pump parts: Selected shafts, stems and fittings where the working fluid is suitable for this steel.
- Industrial fasteners: Bolts, pins and other parts made for high loads.
- Special machinery: Precision parts that need strength together with good toughness.
For large machined parts, a forged bar may be considered if the drawing and grade availability allow it. Check all service conditions before choosing the material.
Sizes and standards
Stainless Steel 13-8PH Round Bar Sizes and Specifications
Bar dimensions and supply conditions should be agreed before an order is placed. The sizes below are only reference ranges. Ask the supplier to confirm available sizes.
| Ordering detail | Information |
|---|---|
| Grade | 13-8PH / UNS S13800 |
| Bar specifications | ASTM A564/A564M; AMS 5629 for specified aerospace bar requirements |
| Indicative round bar diameter | 4 to 500 mm as an indicative range. Confirm actual availability. |
| Indicative length | 1 to 6 m or cut lengths, subject to availability |
| Common finishes | Hot finished, bright drawn, turned or ground as ordered |
| Delivery condition | Solution treated or a specified aged H condition |
| Documents | MTC, heat marking, dimensional checks and any tests required by the order |
The best form depends on the finished part. If the drawing needs another shape, compare hexagonal bar options and confirm that 13-8PH is available in that form.
Chemical composition
Chemical Composition of Stainless Steel 13-8PH Round Bar
The table shows commonly published composition limits for 13-8PH under AMS 5629. Nickel and aluminium are important parts of this grade. Final acceptance must follow the standard stated on the order and the material test certificate.
| Element | Content (% by weight) |
|---|---|
| Carbon (C) | 0.05 max |
| Manganese (Mn) | 0.10 max |
| Phosphorus (P) | 0.010 max |
| Sulfur (S) | 0.008 max |
| Silicon (Si) | 0.10 max |
| Chromium (Cr) | 12.25 to 13.25 |
| Nickel (Ni) | 7.50 to 8.50 |
| Molybdenum (Mo) | 2.00 to 2.50 |
| Aluminium (Al) | 0.90 to 1.35 |
| Nitrogen (N) | 0.010 max |
| Iron (Fe) | Balance |
These values are reference information. Check the current specification edition and MTC for your material.
Strength and heat treatment
Mechanical Properties and Heat Treatment of SS 13-8PH Round Bar
13-8PH changes strength when it is heat treated. The H number shows the ageing condition. H950 generally gives higher strength, while higher ageing temperatures often give lower strength and more room for movement before breaking. The numbers below are published minimum longitudinal values for AMS 5629 and should not be used for every product size or test direction.
| Condition | Tensile strength (MPa) | 0.2% yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| H950 | 1517 | 1413 | 10 |
| H1000 | 1413 | 1310 | 10 |
| H1025 | 1276 | 1207 | 11 |
| H1050 | 1207 | 1138 | 12 |
| H1100 | 1034 | 931 | 14 |
| H1150 | 931 | 621 | 14 |
Do not use a single strength or hardness value for every 13-8PH bar. Ask for the test results that match the ordered size and heat-treatment condition.
Before you order
What Should You Check Before Ordering SS 13-8PH Round Bar?
Working environment
Check whether the steel is suitable for the temperature, moisture and chemicals it will face.
Machining and size
Confirm the diameter, tolerance, surface finish and any extra material needed for machining.
Testing and traceability
Ask for the heat number, MTC, mechanical test results and any extra inspection required.
Grade names
Stainless Steel 13-8PH Grade Names and Standards
13-8PH is known by several names. Check the chemical and mechanical requirements before treating two specifications as the same.
| Name or document | Reference |
|---|---|
| Common name | 13-8PH / PH 13-8 Mo |
| UNS | S13800 |
| EN material number | 1.4534 |
| Bar standard | ASTM A564/A564M |
| Aerospace bar standard | AMS 5629 |
The product standard tells the supplier how the material must be made and tested. It is not an alternative grade name.
Product questions
Stainless Steel 13-8PH Round Bar FAQ
What is 13-8PH stainless steel used for?
It is used for strong parts such as aircraft fittings, shafts, fasteners and certain valve parts. The final choice depends on the design and working conditions.
Can 13-8PH stainless steel be hardened?
Yes. The steel can be strengthened by ageing heat treatment after solution treatment. Common conditions include H950, H1025 and H1150.
What is the difference between 13-8PH and 17-4PH stainless steel?
Both are precipitation hardening stainless steels. They have different alloy compositions and strength and toughness results. Compare 17-4PH round bar with the required drawing before selecting one.
Which standard is used for 13-8PH round bars?
ASTM A564/A564M is a common bar standard. AMS 5629 is also used for certain aerospace bar orders. Always state the needed edition and condition.
Is 13-8PH stainless steel magnetic?
Yes. It is a martensitic stainless steel and is generally magnetic.
What details are needed for a 13-8PH round bar quotation?
Send the grade, standard, diameter, length, quantity, heat-treatment condition, finish, testing requirements and delivery location.